Add type check for all the registry tags · feathr-ai/feathr#256

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Currently the registry tags are a dictionary format like this:

{"description":"this is a test feature"}

but user could easily do something else like

{"description", "this is a test feature"}

and the object will not be serialized as it's not a valid python dict. We should add a type check for that to avoid those kind of errors.

Research direction: The registry tags are expected to be a Python dictionary. To add a type check, locate the code that processes registry tags (likely in a Python file related to feature definition or registry client). Implement a validation function that uses isinstance to ensure the tags input is a dict, and raise a TypeError or ValueError with a descriptive message if it is not. Ensure existing tests pass and consider adding a test for the invalid case.
Tech stack: python
Domain: backenddata
Issue type: Feature
Difficulty: 2
Estimated time: Under 1 hour
Activity status: Blocked
Clarity: Clear
Prerequisites: Basic Python
Newbie friendliness: 85